The addon lets you add custom search engines to the Mozilla Firefox without the Internet connection using! Add your own search engine to the Firefox! Actually mozlz4-edit is a simple mozlz4 file editor. You can open, edit and save mozlz4 files.

mozlz4-edit promo image
What is mozlz4-edit?

'mozlz4-edit' is a Firefox add-on that allows you to add and edit custom search engines in your Mozilla Firefox browser without needing an Internet connection. This versatile tool works best as a mozlz4 file editor, which lets you open, modify, and save mozlz4 files.

Users: 617 ▲ 8
Rating: 4.78 (36)
Version: 4.1.2 (Last updated: 2019-07-07)
Creation date: 2018-03-02
Weekly download count: 5
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • downloads
  • tabs
  • storage
  • unlimitedStorage
  • <all_urls>
Size: 240.27K
URLs: Website
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
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Warning! You should not delete default search engines from a search.json.mozlz4 file if you edit the file. If you delete a default search engine then the Firefox will reset search engine list to a default state. But you can add new search engines. Maybe there is another way to delete default search engines except Firefox Preferences menu but I don't know how.

How to

  1. Find a search.json.mozlz4 file inside of your Mozilla Firefox profile folder.
  2. Open the search.json.mozlz4 file with the mozlz4-edit extension.
  3. Edit a search engine list.
  4. Save the search.json.mozlz4 file in your Mozilla Firefox profile folder, replace the existed search.json.mozlz4 file by your new version.
  5. Restart the Mozilla Firefox.

Note There're .lz4 ( .jsonlz4, .jsonlz4-xxxx, .baklz4 etc) files inside of a Firefox's profile folder but actually they're mozlz4 files. You can try to open and edit these files.

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User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Allows renaming custom search engines
  • Useful for adding svg icons with data URLs to search engines
  • Helpful for customizing search engine in searchbar
  • Great tool for editing search engines
  • Order of custom search engines in the xml does not match the order in the browser
  • Cannot change/add icon to custom search engine
  • Cannot change editor's color theme
  • Add-on is not properly saving to mozlz4
  • Requires unneeded permissions
Most mentioned
  • Allows renaming custom search engines
  • Useful for adding svg icons with data URLs to search engines
  • Customizing search engine in searchbar
  • Editing search engines
View all user reviews
Risk impact

mozlz4-edit is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install mozlz4-edit if you trust the publisher.

Risk likelihood

mozlz4-edit has earned a fairly good reputation and likely can be trusted.

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